1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.myfaces.orchestra.lib;
20
21 /**
22 * <p>
23 * Internal helper class for some class management.
24 * </p>
25 * <p>
26 * <b>Not for use outside of Orchestra</b>
27 * </p>
28 */
29 public final class _ClassUtils
30 {
31 private _ClassUtils()
32 {
33 }
34
35 /**
36 * Create a new instance for a class by its name
37 *
38 * @since 1.1
39 */
40 public static Object newInstance(Class clazz)
41 {
42 try
43 {
44 return clazz.newInstance();
45 }
46 catch(NoClassDefFoundError e)
47 {
48 throw new OrchestraException(e);
49 }
50 catch (InstantiationException e)
51 {
52 throw new OrchestraException(e);
53 }
54 catch (IllegalAccessException e)
55 {
56 throw new OrchestraException(e);
57 }
58 }
59
60 /**
61 * create a new instance for a class by its name
62 */
63 public static Object newInstance(String className)
64 {
65 try
66 {
67 Class clazz = classForName(className);
68 return clazz.newInstance();
69 }
70 catch(NoClassDefFoundError e)
71 {
72 throw new OrchestraException(e);
73 }
74 catch (InstantiationException e)
75 {
76 throw new OrchestraException(e);
77 }
78 catch (IllegalAccessException e)
79 {
80 throw new OrchestraException(e);
81 }
82 catch (ClassNotFoundException e)
83 {
84 throw new OrchestraException(e);
85 }
86 }
87
88 /**
89 * Lookup class using the webapp classloader first and the the classloader which loaded
90 * this class.
91 */
92 public static Class classForName(String className) throws ClassNotFoundException
93 {
94 if (className == null)
95 {
96 throw new NullPointerException("className");
97 }
98
99 try
100 {
101 // Try WebApp ClassLoader first
102 return Class.forName(className,
103 false, // do not initialize for faster startup
104 Thread.currentThread().getContextClassLoader());
105 }
106 catch (ClassNotFoundException ignore)
107 {
108 // fallback: Try ClassLoader for this class (i.e. the myfaces.jar lib)
109 return Class.forName(className,
110 false, // do not initialize for faster startup
111 _ClassUtils.class.getClassLoader());
112 }
113 }
114 }